Feedback information transmission method and communication device

Abstract

This application provides a method to improve resource utilization efficiency of an uplink control channel that carries feedback information. A terminal device receives one or more downlink channels carried in one or more first time units, the first time units belonging to in a time unit set; determines a second time unit for carrying feedback information corresponding to the downlink channels according to a first association relationship between the time unit set and the second time unit; determines a first codebook; and sends uplink control information including the first codebook in the second time unit. When one of the downlink channels is received in first time units that belong to a subset of the time unit set, and there is a second association relationship between the subset of the time unit set and the second time unit, the first codebook includes only feedback information corresponding to the downlink channel carried in the first time units in the subset.

What is claimed is: 
     
       1. A feedback information transmission method, comprising:
 obtaining, by a terminal device, a first association relationship between a time unit set comprising one or more first time units and a second time unit,
 wherein the one or more first time units is for transmitting one or more physical downlink shared channels (PDSCHs), and 
 wherein the second time unit is for transmitting feedback information associated with the one or more PDSCHs; 
 
 receiving, by the terminal device, from a network device, a first physical downlink control channel (PDCCH) which schedules a first PDSCH,
 wherein the first PDCCH carries timing indication information indicating a timing relationship between a time unit carrying the first PDSCH and the second time unit; 
 
 receiving, by the terminal device, at least one PDSCH of the one or more PDSCHs from the network device, wherein the at least one PDSCH includes the first PDSCH; 
 determining, by the terminal device, the second time unit according to the timing indication information; 
 determining, by the terminal device, according to the first association relationship and the timing indication information, a second association relationship between a subset of the time unit set and the second time unit,
 wherein the subset of the time unit set comprises at least one time unit carrying the received at least one PDSCH; 
 
 determining, by the terminal device, a first codebook according to feedback information associated with the received at least one PDSCH; and 
 sending, by the terminal device, uplink control information including the first codebook in the second time unit,
 wherein the first codebook is determined according to a preset condition, and the preset condition comprises a first condition wherein, 
 the first codebook includes only feedback information associated with the first PDSCH carried in the one or more first time units that belong to the subset of the time unit set in response to the second association relationship comprising only an association relationship between the time unit carrying the first PDSCH and the second time unit. 
 
 
     
     
       2. The method according to  claim 1 , wherein the preset condition further comprises a second condition, and the second condition is that a value of downlink assignment indicator (DAI) for dynamically scheduling the first PDSCH is 1. 
     
     
       3. The method according to  claim 1 , wherein the preset condition further comprises a third condition, and the third condition is that the first PDSCH is carried in a primary frequency domain unit or a first secondary frequency domain unit in one or more frequency domain units configured for the terminal device. 
     
     
       4. The method according to  claim 1 , wherein based on the first condition not being met, the first codebook includes feedback information corresponding to all PDSCHs received in all first time units in the time unit set. 
     
     
       5. The method according to  claim 1 , wherein the first association relationship is predefined; or the first association relationship is configured for the terminal device by the network device via radio resource control (RRC) signaling. 
     
     
       6. The method according to  claim 1 , further comprising:
 determining, by the terminal device, a semi-persistent codebook mode from a plurality of candidate codebook modes, wherein the plurality of candidate codebook modes comprise the semi-persistent codebook mode and a dynamic codebook mode. 
 
     
     
       7. The method according to  claim 1 , wherein the first PDCCH is a control channel for fallback scheduling. 
     
     
       8. The method according to  claim 7 , wherein the control channel for fallback scheduling has at least one of the following characteristics:
 the control channel for fallback scheduling is used for data scheduling performed before a radio resource control (RRC) connection is established; or 
 none of values of fields in the control channel for fallback scheduling is configured by using RRC dedicated signaling. 
 
     
     
       9. A communication apparatus comprising:
 a memory configured to store a computer program; and 
 a processor configured to execute the computer program stored in the memory, to enable the communication apparatus to:
 obtain a first association relationship between a time unit set comprising one or more first time units and a second time unit,
 wherein the one or more first time units is for transmitting one or more physical downlink shared channels (PDSCHs), and 
 wherein the second time unit is for transmitting feedback information corresponding to the one or more PDSCHs; 
 
 receive, from a network device, a first physical downlink control channel (PDCCH) that schedules a first PDSCH,
 wherein the first PDCCH comprises timing indication information indicating a timing relationship between a time unit carrying the first PDSCH and the second time unit; 
 
 receive at least one PDSCH of the one or more PDSCHs from the network device, wherein the at least one PDSCH includes the first PDSCH; 
 determine the second time unit according to the timing indication information; 
 determine, according to the first association relationship and the timing indication information, a second association relationship between a subset of the time unit set and the second time unit,
 wherein the subset of the time unit set comprises at least one time unit carrying the received at least one PDSCH; 
 
 determine a first codebook according to feedback information associated with the received at least one PDSCH; and 
 send uplink control information including the first codebook in the second time unit,
 wherein the first codebook is determined according to a preset condition, and the preset condition comprises a first condition where, the first codebook includes only feedback information associated with the first PDSCH in response to the second association relationship comprising only an association relationship between the time unit carrying the first PDSCH and the second time unit. 
 
 
 
     
     
       10. The apparatus according to  claim 9 , wherein the preset condition further comprises a second condition, and the second condition is that a value of downlink assignment indicator (DAI) for dynamically scheduling the first PDSCH is 1. 
     
     
       11. The apparatus according to  claim 9 , wherein the preset condition further comprises a third condition, and the third condition is that the first PDSCH is carried in a primary frequency domain unit or a first secondary frequency domain unit in one or more frequency domain units configured for the apparatus. 
     
     
       12. The apparatus according to  claim 9 , wherein based on the first condition not being met, the first codebook includes feedback information corresponding to all PDSCHs received in all first time units in the time unit set. 
     
     
       13. The apparatus according to  claim 9 , wherein the first association relationship is predefined; or the first association relationship is configured for the apparatus by the network device via radio resource control (RRC) signaling. 
     
     
       14. The apparatus according to  claim 9 , wherein the computer program further enables the apparatus to:
 determine a semi-persistent codebook mode from a plurality of candidate codebook modes, wherein the plurality of candidate codebook modes comprise the semi-persistent codebook mode and a dynamic codebook mode. 
 
     
     
       15. The apparatus according to  claim 9 , wherein the first PDCCH is a control channel for fallback scheduling. 
     
     
       16. The apparatus according to  claim 15 , wherein the control channel for fallback scheduling has at least one of the following characteristics:
 the control channel for fallback scheduling is used for data scheduling performed before a radio resource control (RRC) connection is established; or 
 none of values of fields in the control channel for fallback scheduling is configured by using RRC dedicated signaling. 
 
     
     
       17. A communication apparatus comprising:
 a memory configured to store a computer program; and 
 a processor configured to execute the computer program stored in the memory, to enable the communication apparatus to:
 obtain a first association relationship between a time unit set comprising one or more first time units and a second time unit,
 wherein the one or more first time units is for transmitting one or more physical downlink shared channels (PDSCHs), and 
 wherein the second time unit is for transmitting feedback information associated with the one or more PDSCHs; 
 
 send a first physical downlink control channel (PDCCH) that schedules a first PDSCH to a terminal device,
 wherein the first PDCCH comprises timing indication information indicating a timing relationship between a time unit carrying the first PDSCH and the second time unit; 
 
 send at least one PDSCH of the one or more PDSCHs, wherein the at least one PDSCH includes the first PDSCH; 
 determine the second time unit according to the timing indication information; and 
 receive, in the second time unit, uplink control information from the terminal device,
 wherein the uplink control information includes a first codebook determined according to feedback information associated with the received at least one PDSCH, and 
 wherein the first codebook is determined according to a preset condition, and the preset condition comprises a first condition where the first codebook includes only feedback information associated with the first PDSCH in response to a second association relationship comprising only an association relationship between the time unit carrying the first PDSCH and the second time unit, 
 wherein the second association relationship between a subset of the time unit set and the second time unit is determined according to the first association relationship and the timing indication information, and 
 wherein the subset of the time unit set comprises at least one time unit carrying the received at least one PDSCH. 
 
 
 
     
     
       18. The apparatus according to  claim 17 , wherein the preset condition further comprises a second condition, and the second condition is that a value of downlink assignment indicator (DAI) for dynamically scheduling the first PDSCH is 1. 
     
     
       19. The apparatus according to  claim 17 , wherein the preset condition further comprises a third condition, and the third condition is that the first PDSCH is carried in a primary frequency domain unit or a first secondary frequency domain unit in one or more frequency domain units configured for the terminal device. 
     
     
       20. The apparatus according to  claim 17 , wherein based on the first condition not being met, the first codebook includes feedback information corresponding to all PDSCHs received in all first time units in the time unit set. 
     
     
       21. The apparatus according to  claim 17 , wherein the computer program further enables the apparatus to:
 determine a semi-persistent codebook mode from a plurality of candidate codebook modes, wherein the plurality of candidate codebook modes comprise the semi-persistent codebook mode and a dynamic codebook mode; and 
 configure the semi-persistent codebook mode for the terminal device via signaling.